If you're just reposting photos from other accounts, I don't think you can earn much besides selling cheap shoutouts and affiliate marketing.

Problem is you can't embed links into your post, unlike Youtube/FB/Twitter.

You really need to sell yourself and be a "social media influencer" to entice brands to advertise on your page.

Even then, it will affect the engagement of your Instagram account because your followers won't like ads.

Naturally, female influencers with large female followings are the most profitable.